Patents by Inventor Masahiko Ohta
Masahiko Ohta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8829472Abstract: An image display device includes an excitation light source; a fluorescent screen including a plurality of phosphor regions that are repeatedly formed in an in-plane direction and a retro-reflection region that reflects a part of incident light in the opposite direction of the incident light; a scanning unit that scans a surface of fluorescent screen on which the phosphor regions and the retro-reflection region are formed with excitation light from the excitation light source; a photo detection unit that outputs signal value that varies on the basis of an incident light amount onto the photo detection unit; a reflection unit that reflects retro-reflection light of the excitation light directed from the retro-reflection region to the photo detection unit; and a control unit that causes the scanning unit to scan the fluorescent screen, detects boundaries between the phosphor regions and the retro-reflection region on the fluorescent screen.Type: GrantFiled: February 29, 2012Date of Patent: September 9, 2014Assignee: NEC CorporationInventors: Masahiko Ohta, Kazuhiko Aoki
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Publication number: 20140210156Abstract: A sheet ejector is provided that includes an ejection roller unit including a first roller and a second roller, a pushing member that rotates concentrically with the first roller and includes a projection formed on a circumferential surface thereof, the projection contacting a trailing end of a sheet to be ejected and pushing out the sheet in an ejecting direction, and a contact member including a contact portion disposed, in a view along a rotational-axis direction of the first roller, in such a position as to overlap or be downstream relative to a most downstream position of a rotational trajectory of the pushing member in the ejecting direction, the contact portion configured to extend up to a position closer to the second roller than the rotational axis of the first roller and contact the trailing end of the sheet ejected from the ejection roller unit.Type: ApplicationFiled: January 30, 2014Publication date: July 31, 2014Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventor: Masahiko OHTA
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Publication number: 20140211275Abstract: A sheet feeding apparatus includes a first tray, a second tray disposed above the first tray, a feeding portion configured to feed a sheet in a feed direction, and a first wall portion disposed at one end of the second tray in a width direction and fixed relative to the first tray. The first tray has a first end on a side far from the feeding portion. The second tray has, on the side far from the feeding portion, a second end, which is closer to the feeding portion than the first end of the first tray. The first end of the first tray is located above the second end of the second tray. An upper end of the first wall portion is higher than the second tray, and extends from a side closer to the second end of the second tray toward the first end of the first tray.Type: ApplicationFiled: January 31, 2014Publication date: July 31, 2014Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventor: Masahiko Ohta
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Publication number: 20140211274Abstract: A sheet feeding apparatus includes a first tray, a frame member, and a feeder. The frame member includes a first wall portion facing in a width direction and a first tray portion disposed above the first tray and extending inward in the width direction from the first wall portion. The first tray has a first end on a side far from the feeder. The first tray portion of the frame member has a second end on the side far from the feeder and a third end on a side near the feeder. The second end is closer to the feeder than the first end. The first wall portion extends from the third end toward the first end.Type: ApplicationFiled: January 31, 2014Publication date: July 31, 2014Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventor: Masahiko Ohta
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Publication number: 20140118988Abstract: A fluorescent screen includes phosphor regions 1-R, 1-G, diffusion region 1-B and reflecting means 10 formed on a region that includes phosphor regions 1-R and 1-G and diffusion region 1-B. Reflecting means 10 includes fluorescent light reflecting layer 11, phase difference layer 12, and polarizing layer 13 deposited in that order. Fluorescent light reflecting layer 11 transmits excited light 4 and reflects fluorescent light from phosphor regions 1-R and 1-G. Polarizing layer 13 both transmits excited light 4 and, of diffused light of the excited light (4) that was entered from diffusion region 1_B through Phase difference layer 12, transmits TM polarized light and reflects TE polarized light.Type: ApplicationFiled: May 28, 2012Publication date: May 1, 2014Applicant: NEC CorporationInventors: Kazuhiko Aoki, Masahiko Ohta
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Patent number: 8648964Abstract: A multi-projection display system is provided with a plurality of sensor units corresponding to projector units. The sensor units detect brightness for each color in a projected image that is projected on a screen and supply the detection results. The projector unit generates a brightness correction table on the basis of the image signal of a specific picture element of the projected image realized by an adjacent projector unit and on the basis of the brightness of the specific picture element of the projected image of the adjacent projector unit that is detected by a sensor unit for matching the brightness of the image projected by its own projector unit with that of the adjacent projector unit, refers to the brightness correction table to correct brightness for each color of the image signals that are received as input, and projects onto a screen the light of each color in accordance with the corrected image signals.Type: GrantFiled: November 7, 2011Date of Patent: February 11, 2014Assignee: NEC CorporationInventors: Osamu Ishibashi, Yoshiho Yanagita, Masahiko Ohta, So Nishimura
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Publication number: 20130335641Abstract: A projection screen includes: phosphor regions arranged cyclically in an in-plane direction of a display region; a plurality of black stripes and reference black stripes that partition the display region into the phosphor regions; and an optical information formation unit that is provided in a specific position within the display region and that generates readable optical information.Type: ApplicationFiled: March 2, 2012Publication date: December 19, 2013Inventors: Kazuhiko Aoki, Masahiko Ohta, So Nishimura, Yoshiho Yanagita, Osamu Ishibashi, Fujio Okumura
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Publication number: 20130335390Abstract: A multi-projection display includes: a plurality of projector units; a plurality of optical sensors that are provided corresponding to each of the projector units; and a main control unit that both causes adjustment images to be projected by each of the projector units and vertically synchronizes each projected adjustment image. Each projector unit acquires by a respective optical sensor brightness values of the picture elements that are adjacent between the adjustment image that is projected by the projector unit and the adjustment images that are projected by other projector units and adjusts the brightness of the projected image based on the differences in the acquired brightness values.Type: ApplicationFiled: February 14, 2012Publication date: December 19, 2013Applicant: NEC CorporationInventors: Osamu Ishibashi, Fujio Okumura, Yoshiho Yanagita, Masahiko Ohta, So Nishimura
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Publication number: 20130320236Abstract: An image display device includes an excitation light source; a fluorescent screen including a plurality of phosphor regions that are repeatedly formed in an in-plane direction and a retro-reflection region that reflects a part of incident light in the opposite direction of the incident light; a scanning unit that scans a surface of the fluorescent screen on which the phosphor regions and the retro-reflection region are formed with excitation light from the excitation light source; a photo detection unit that outputs signal value that varies on the basis of an incident light amount onto the photo detection unit; a reflection unit that reflects retro-reflection light of the excitation light directed from the retro-reflection region to the photo detection unit; and a control unit that causes the scanning unit to scan the fluorescent; detects boundaries between the phosphor regions and the retro-reflection region on the fluorescent screen based on the output signal of the photo detection unit, and controls a lighType: ApplicationFiled: February 29, 2012Publication date: December 5, 2013Inventors: Masahiko Ohta, Kazuhiko Aoki
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Publication number: 20130278906Abstract: A projector includes a screen having a periodic array of color stripes for producing visible light depending on incident light, a light source that remits a light beam, a projection unit that scans an area of the screen where the color stripes are disposed, with the light beam in a direction across the color stripes, to display an image on the screen, a detector that detects the visible light from each of the color stripes as a feedback light pulse, and a controller that adjusts a start-of-emission timing of the light source based on a start-of-detection timing at which the feedback light pulse is detected by the detector and a detection period during which the feedback light pulse is detected by the detector, and controlling the light source to emit the light beam in order to apply light pulses to the color stripes within boundaries thereof.Type: ApplicationFiled: October 20, 2011Publication date: October 24, 2013Inventors: Yoshiho Yanagita, Osamu Ishibashi, Kazuhiko Aoki, Masahiko Ohta, So Nishimura
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Publication number: 20130229580Abstract: A multi-projection display system is provided with a plurality of sensor units corresponding to projector units. The sensor units detect brightness for each color in a projected image that is projected on a screen and supply the detection results. The projector unit generates a brightness correction table on the basis of the image signal of a specific picture element of the projected image realized by an adjacent projector unit and on the basis of the brightness of the specific picture element of the projected image of the adjacent projector unit that is detected by a sensor unit for matching the brightness of the image projected by its own projector unit with that of the adjacent projector unit, refers to the brightness correction table to correct brightness for each color of the image signals that are received as input, and projects onto a screen the light of each color in accordance with the corrected image signals.Type: ApplicationFiled: November 7, 2011Publication date: September 5, 2013Applicant: NEC CORPORATIONInventors: Osamu Ishibashi, Yoshiho Yanagita, Masahiko Ohta, So Nishimura
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Patent number: 8509576Abstract: An optical switch includes electro-optic crystal, and electrode unit including a plurality of electrodes arranged on the same plane in electro-optic crystal to extend in parallel to one another. A refractive index of a part of electro-optic crystal is changed by an electric field generated at electrode unit, thereby switching transmission and reflection of light incident on electro-optic crystal. Electro-optic crystal has an entrance surface through which light enters and an exit surface from which light exits. Electrode unit is located between the entrance surface and the exit surface. An angle ?x formed between a longitudinal direction of electrodes and at least one surface from among the entrance surface and the exit surface is set near an angle that satisfies the expression ?x=90°?Sin?1[ cos(Tan?1(n))] in a wavelength of light to be modulated.Type: GrantFiled: December 14, 2009Date of Patent: August 13, 2013Assignee: NEC CorporationInventors: Masahiko Ohta, Osamu Ishibashi, Fujio Okumura
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Publication number: 20130176705Abstract: A light source device includes a light source unit concluding LD element (1) for emitting a laser beam polarized in a particular direction and lens (2) for condensing the laser beam emitted from LD element (1) and phosphor layer (3) excited by the laser beam condensed by lens (2) of the light source unit to discharge incoherent light. The incident angle of the laser beam to phosphor layer (3) is larger than 0° and smaller than 90°, and the laser beam enters phosphor layer (3) as P-polarized light.Type: ApplicationFiled: May 31, 2011Publication date: July 11, 2013Applicant: NEC CORPORATIONInventor: Masahiko Ohta
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Patent number: 8422110Abstract: An optical switch changes the refractive index of an electro-optical crystal according to an electric field applied to the electro-optical crystal so as to switch depending on whether the electro-optical crystal enables incident light to pass through or whether the electro-optical crystal enables incident light to be totally reflected. The optical switch includes an electrode section including a plurality of electrodes and formed in the electro-optical crystal, a principal plane including the largest area of each electrode on a same plane of the electro-optical crystal; an insulator layer on at least one plane of the electro-optical crystal, the plane being parallel with the electrode section, the insulator layer made of an insulator with lower dielectric constant than the electro-optical crystal; and a temperature control device formed on and in contact with the insulator layer and controls a temperature of the electrode section or dissipates heat generated in the electrode section.Type: GrantFiled: December 16, 2009Date of Patent: April 16, 2013Assignee: NEC CorporationInventors: Masahiko Ohta, Osamu Ishibashi, Fujio Okumura
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Publication number: 20130010849Abstract: A wireless transmission system includes a wireless HDMI transmitter and a wireless HDMI receiver. The wireless HDMI transmitter includes a carrier oscillator provided for each channel of an HDMI transmission path to output a carrier signal in a millimeter band, an OOK modulator provided for each carrier oscillator to perform on-off keying modulation on a carrier signal outputted by its corresponding carrier oscillator, and an input circuit provided for each channel of the HDMI transmission path to input a digital signal outputted by a source device to the OOK modulator. Radio signals have different planes of polarization from their adjacent channels.Type: ApplicationFiled: March 17, 2011Publication date: January 10, 2013Applicants: Silicon Library Inc., Hiroshima University, Hitachi Chemical Co., Ltd.Inventors: Junzoh Shimizu, Minoru Fujishima, Masahiko Ohta, Toshio Takada
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Publication number: 20110255148Abstract: An optical switch changes the refractive index of an electro-optical crystal according to an electric field applied to the electro-optical crystal so as to switch depending on whether the electro-optical crystal enables incident light to pass through or whether the electro-optical crystal enables incident light to be totally reflected. The optical switch includes an electrode section including a plurality of electrodes and formed in the electro-optical crystal, a principal plane including the largest area of each electrode on a same plane of the electro-optical crystal; an insulator layer on at least one plane of the electro-optical crystal, the plane being parallel with the electrode section, the insulator layer made of an insulator with lower dielectric constant than the electro-optical crystal; and a temperature control device formed on and in contact with the insulator layer and controls a temperature of the electrode section or dissipates heat generated in the electrode section.Type: ApplicationFiled: December 16, 2009Publication date: October 20, 2011Applicant: NEC CORPORATIONInventors: Masahiko Ohta, Osamu Ishibashi, Fujio Okumura
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Publication number: 20110243497Abstract: An optical switch includes electro-optic crystal, and electrode unit including a plurality of electrodes arranged on the same plane in electro-optic crystal to extend in parallel to one another. A refractive index of a part of electro-optic crystal is changed by an electric field generated at electrode unit, thereby switching transmission and reflection of light incident on electro-optic crystal. Electro-optic crystal has an entrance surface through which light enters and an exit surface from which light exits. Electrode unit is located between the entrance surface and the exit surface. An angle ?x formed between a longitudinal direction of electrodes and at least one surface from among the entrance surface and the exit surface is set near an angle that satisfies the expression ?x=90°?Sin?1[cos(Tan(n))] in a wavelength of light to be modulated.Type: ApplicationFiled: December 14, 2009Publication date: October 6, 2011Applicant: NEC CORPORATIONInventors: Masahiko Ohta, Osamu Ishibashi, Fujio Okumura
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Patent number: 6720931Abstract: A beam scanning plane antenna is formed by stacking, in order, a system connecting portion, a Rotman lens portion, and a beam scanning antenna portion. The system connecting portion is formed by stacking, in order, a fourth grounding conductor, a sixth dielectric, a connecting substrate and a fifth dielectric. The Rotman lens portion is formed by stacking, in order, a third grounding conductor, a fourth dielectric, a Rotman lens substrate and a third dielectric. The beam scanning antenna portion is formed by stacking, in order, a second grounding conductor, a second dielectric, a power feeding substrate, a first dielectric and a first grounding conductor. A plurality of antenna groups that each include an irradiating element, a power feeding line and a first connecting portion, are formed on the power feeding substrate. The Rotman lens substrate includes a Rotman lens pattern, a second connecting portion and a third connecting portion.Type: GrantFiled: October 16, 2002Date of Patent: April 13, 2004Assignee: Hitachi Chemical Co., Ltd.Inventors: Takao Michisaka, Masahiko Ohta, Hisayoshi Mizugaki, Kiichi Kanamaru
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Patent number: 6545572Abstract: This triplate line interfacial connector electrically connects a first triplate line comprised of a first grounding conductor, first dielectric, first power feeding substrate, second dielectric and second grounding conductor, and a second triplate line comprised of a second grounding conductor, third dielectric, second power feeding substrate, fourth dielectric, and third grounding conductor. A patch pattern is formed at a connecting terminal portion of each power feeding line. Two shield spacers each having a through portion around the patch pattern are provided. A first slot is formed at a connecting position between the two triplate lines in the second grounding conductor.Type: GrantFiled: September 7, 2000Date of Patent: April 8, 2003Assignee: Hitachi Chemical Co., Ltd.Inventors: Masahiko Ohta, Mitsuru Hirao, Hisayoshi Mizugaki, Takao Michisaka, Kiichi Kanamaru
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Patent number: 5510803Abstract: A dual-polarization planar antenna includes: a first feeding substrate having a plurality of first radiation elements and a first feeding line; a first dielectric member; a first ground conductor having a plurality of slots; a second dielectric member; a second feeding substrate having a plurality of second radiation elements and a second feeding line; a third dielectric member; and a second ground conductor. The first feeding substrate, the first dielectric member, the first ground conductor, the second dielectric member, the second feeding substrate, the third dielectric member, and the second ground conductor are successively superposed in this order. The first feeding substrate, the first ground conductor, and the second feeding substrate are arranged so that the slots, the first radiation elements, and the second radiation elements are overlapped with one another at the same positions.Type: GrantFiled: November 21, 1994Date of Patent: April 23, 1996Assignee: Hitachi Chemical Company, Ltd.Inventors: Hironori Ishizaka, Shigetoo Wakushima, Hisayoshi Mizugaki, Masahiko Ohta